Drone aircraft



FIG. 1 is a perspective view of a drone aircraft showing our new design;

FIG. 2 is another perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a back view thereof;

FIG. 5 is a left view thereof;

FIG. 6 is a right view thereof;

FIG. 7 is a top view thereof;

FIG. 8 is a bottom view thereof;

FIG. 9 is a partially enlarged view of FIG. 1;

FIG. 10 is a partially enlarged view of FIG. 2;

FIG. 11 is a partially enlarged view of FIG. 3;

FIG. 12 is a partially enlarged view of FIG. 7; and,

FIG. 13 is another partially enlarged view of FIG. 7.

The broken lines shown on the drawings depict portions of the drone aircraft that form no part of the claimed design. 

CLAIM The ornamental design for a drone aircraft, as shown and described. 